A Company Has an AWS CloudFormation Template That Is Stored

Multiple Choice

A company has an AWS CloudFormation template that is stored as a single file. The template is able to launch and create a full infrastructure stack. Which best practice would increase the maintainability of the template?

A) Use nested stacks for common template patterns.
B) Embed credentials to prevent typos.
C) Remove mappings to decrease the number of variables.
D) Use AWS::Include to reference publicly-hosted template files. Use AWS::Include to reference publicly-hosted template files.